DIY Robot Lawn Mower

Home-made robot lawn mower. Barbie Jeep + control system + blades & motors. Uses buried wire (electronic dog fence), bumpers, and flaps for navigation. Biased random steering. Transcript: So here's the world famous pink and green lawn mower. Pink for these wheels -- this thing started out life as a Barbie Jeep -- and green for this battery -- doesn't use any gas. It's, uh, got little bumpers...I'll show you how those things work. It's got little flaps...coated with aluminum so that when they touch, the mower knows it's hit something. It's got a little control system -- a *really* little control system: couple of NAND gates, couple of timers, some relays, stuff like that. And that's the basic mower that just responds to the bumpers and the flaps. But it's also got -- I don't know if you can see it -- some coils down here that listen to my electronic dog fence, and a circuit I got off the internet that reads those guys, and treats them just like the bumpers or the flaps, so whenever it hits something it goes in the other direction, until it hits something and then it goes in the other direction. So... Let me turn it over, and take a look at the cutters. There's three motors with little plastic wheels [disks] on them, little razor blades attached to the wheels [disks], and that's it for the cutting. There you can see the...what I salvaged from the Barbie Jeep, the motors and the wheels and the chassis. It's got an independent suspension, so it doesn't get hung up too much ...